1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Wordsense Learn about the wordsenses of the english term.

ETYMOLOGY

KOREAN 3.0 Eng Wordtype Etym. Gb Vie
☆☆ STIMULUS; STIMULATION; IMPULSE Noun 刺戟刺激 sự kích thích, sự tác động
☆ IMPULSE; URGE Noun 冲动冲动 sự kích động
☆ PULSE Noun 脉搏脉搏 mạch đập